Button.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Ripple effect</title>
    <style>
        :root {
            --blue: #0943ff;
            --tblue: #0942ffbb;
        }

        * {
            margin: 0;
            box-sizing: border-box;
        }

        body {
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
            height: 100vh;
        }

        button {
            font-size: 1.25rem;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            border: 3px solid var(--blue);
            color: var(--blue);
            background-color: transparent;
            transition: all 0.2s;
            font-weight: 500;
            margin: 2px;
            letter-spacing: 1px;
            position: relative;
            overflow: hidden;
        }

        button:hover {
            background-color: var(--blue);
            color: white;
        }

        button:active {
            background-color: #0027a7;
            color: white;
        }

        button:focus {
            outline: none;
            box-shadow: 0 0 1.5px 3px var(--tblue);
        }

        button span {
            position: absolute;
            transform: translate(-50%, -50%);
            background-color: #fff;
            border-radius: 50%;
            pointer-events: none;
            animation: ripple 1s;
        }

        @keyframes ripple {
            0% {
                width: 0px;
                height: 0px;
                opacity: 0.5;
            }

            100% {
                width: 500px;
                height: 500px;
                opacity: 0;
            }
        }
    </style>
</head>

<body>
    <button style="width:500px;height:500px">hello</button>
    <br>
    <button style="width:20rem">hii</button>
</body>
<script>
    btns = document.querySelectorAll("button")
    btns.forEach(btn => {
        btn.onclick = ripple
    })
    function ripple(e) {
        let { clientX, clientY, target } = e;
        //let { clientX, clientY } = e;
        [clientX, clientY] = [clientX - target.offsetLeft, clientY - target.offsetTop];
        //[clientX, clientY] = [clientX - this.offsetLeft, clientY - this.offsetTop];

        let ripple = document.createElement("span");
        ripple.style.left = clientX + "px";
        ripple.style.top = clientY + "px";

        this.appendChild(ripple);

        setTimeout((element, ripple) => {
            element.removeChild(ripple);

        }, 1000, this, ripple);
    }
</script>

</html>